Open AccessThe Fundamental Role of Nano-Scale Oxide Films in the Oxidation of Hydrogen and the Reduction of Oxygen on Noble Metal Electrocatalysts
Author(s) -
Digby D. Macdonald
Publication year - 2005
Language(s) - English
Resource type - Reports
DOI - 10.2172/838754
Subject(s) - electrocatalyst , oxide , cathode , anode , materials science , hydrogen , oxygen , nanotechnology , chemical engineering , substrate (aquarium) , metal , noble metal , nanoscopic scale , fuel cells , inorganic chemistry , chemistry , electrode , electrochemistry , metallurgy , organic chemistry , oceanography , engineering , geology
The derivation of successful fuel cell technologies requires the development of more effective, cheaper, and poison-resistant electrocatalysts for both the anode (H{sub 2} oxidation in the presence of small amounts of CO from the reforming of carbonaceous fuels) and the cathode (reduction of oxygen in the presence of carried-over fuel). The proposed work is tightly focused on one specific aspect of electrocatalysis; the fundamental role(s) played by nanoscale (1-2 nm thick) oxide (''passive'') films that form on the electrocatalyst surfaces above substrate-dependent, critical potentials, on charge transfer reactions, particularly at elevated temperatures (25 C < T < 200 C). Once the role(s) of these films is (are) adequately understood, we will then use this information to specify, at the molecular level, optimal properties of the passive layer for the efficient electrocatalysis of the oxygen reduction reaction